thinking about a 4bt swap

so i was at my cousins diesel and off road performance shop today and i was talking to him and his mechanic about my truck. and i told theme i like the 460 for the power and torque but not the mpg. and then his mechanic suggested a 4bt swap he said it gets 20+mpg and can make good power/torque. and he said for me he could do it for about 5000$ with a 5 speed swap included. what is the 4bt capable of would it make 300-400 hp and a lot of torque with mods is it mod friendly and is what he is asking for the job a good price. or should i stick with the 460 and rebuild it for the hp and torque i want.

I am no expert but I think 300-400hp is on the high end for a 4bt. Its just a smaller version of the 6bt. Dont think there is as much aftermarket for it, but im not sure . Look at CO425 swap, he has way more than 5000 into his and he did all the labor himself.

They will get good mileage, I believe there is a few swaps done one this site. Just seems on the low end to get a quality swap with all new parts. Just my 2 cents.

A 4BT in "working" form would put out 110-120 HP with lots of torque. With correct gearing it could give good mileage. By no means fast or strong in a heavy towing application. Think of it as a high torque, high mileage alternative to a 300 ci Ford six.

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